[aprssig] Is floating point telemetry allowed in APRS?

Charles Bland root at blandranch.net
Wed Mar 27 16:25:39 CDT 2013


The decimal points are NOT in the spec.  -Chuck

On Wed, Mar 27, 2013 at 1:32 PM, Andrew P. <andrewemt at hotmail.com> wrote:

> Whoops. I take that back. Here's a local guy near my house doing it.
>
> WA3NOA-RI>RXTLM-2,TCPIP,qAR,WA3NOA-5:T#043,0.2,0.0,1.0,0.0,0.0,00000000
>
> By the way, what's the RXTLM destination code for? I'll have to ask him
> (he's in my local ARES group).
>
> Andrew Pavlin, KA2DDO
> ------Original Message------
> From: Steve Dimse
> To: aprssig at tapr.org
> Sent: Mar 27, 2013 4:09 PM
> Subject: Re: [aprssig] Is floating point telemetry allowed in APRS?
>
>
> The spec is not fluid that way. If it says telemetry should look like
>
> T#005,199,000,255,073,123,01101001
>
> sending
>
> T#005,199.1,000,255,073,123,01101001
>
> is not within the spec, and many parsers will reject the packet outright,
> others might truncate, still others might crash. The results are undefined
> and therefore should not be used. The whole point of the spec was to have
> data that everyone could understand in the same way.
>
> People that have non-standard needs are supposed to use the user-defined
> part of the spec which allows for any data one might need without causing
> problems in other parsers.
>
> Can you give an example of such a packet?
>
> Steve K4HG
>
>
>
> On Mar 27, 2013, at 4:01 PM, Charles Blackburn wrote:
>
> > that is a good question, although i would assume that you could just
> drop the fraction and be done with it.
> >
> > charlie
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> >
>
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